RAMA RAO, C.V.SRAVANA BINDU, GORLA2016-06-042016-06-042010http://krishikosh.egranth.ac.in/handle/1/66778Studies on “Pod borer complex in pigeonpea (Cajanus cajan (L.) Millsp.,) genotypes and their management with bio-rational insecticides” were undertaken during Kharif 2009-2010 at Regional Agricultural Research Station, Lam, Guntur. Twenty five genotypes of pigeonpea were selected for screening and replicated thrice in a Simple Randomized Block Design. The evaluation of different genotypes against the pod borer complex under field conditions revealed that the genotypes LRG-30 (4.85%), WRP 1-2 (5.26%), TAT-96-29 (6.36%), SM-9 (6.48%), GPM-43(6.56%) and BSMR 737 (6.76%) were on par with each other with respect to the inflorescence damage due to Maruca vitrata (Geyer). The least pod damage due to M. vitrata was recorded in SM-54 (7.7%) followed by NSM-166 (9.56%), 8-1 (9.65%), SM-58 (10.02%), CHILAKA-1 (10.16%), PERINAL-1 (11.55%) and WRG-150 (12.58%) among 25 genotypes screened. Among 25 genotypes screened, the lowest pod damage due to Melanagromyza obtusa (Malloch) was recorded in SM-54 (6.15%), followed by MAHANADI-1 (6.23%), SM-114 (9.10%), JSM-8 (9.40%), and WRG-150 (9.92%). Among 25 genotypes screened, significantly lowest pod damage due to Helicoverpa armigera (Hubner) was recorded in PERINAL-1 (11.53%) and WRG-150 (12.85%). Among the entries evaluated, CHILAKA-1 recorded the highest yield of 866.66 g/5m length which was followed by LRG-30 (850.00 g/5m) and WRG-150 (818.33 g/5m). Among seven bio-rational insecticides evaluated for their efficacy against pod borer complex, treatments like Bacillus thuringiensis (Ber.) @ 2 ml/l and NSKE @ 5% and the chemical check chlorpyriphos + dichlorvos @ 2.5 + 1 ml/l were effective in suppressing the inflorescence damage. Next effective treatments were Verticillium sp (Zimmermann) Viegas @ 5g/l, Metarrhizium anisopliae (Metch.) Sorokin @ 5g/l, Heterosternma indica (Mclichar) @ 30 lakh nematodes/l, Beauveria bassiana (Balsamo) Vuillemin @ 5g/l and Nomuraea rileyi (Farlow) Samson @ 5g/l. Bt @ 2ml/lt and NSKE 5% were on par with each other with least pod damage by M. vitrata H. armigera (2.94% and respectively. 2.97%) (7.09% and 7.48%), and M. obtusa (5.43 % and 7.31%), The chemical check chlorpyriphos + dichlorvos @ 2.5 + 1ml/l which recorded 41.26% inflorescence damage and 6.76, 2.09 and 4.25 per cent pod damage due to M. vitrata, H. armigera and M. obtusa, respectively and was significantly superior over other treatments. Among the bio-rational insecticides the highest yield was recorded in Bt @ 2 ml/l (999.87 Kg/ha) followed by NSKE 5% (955.53 Kg/ha) with 102.23 and 93.25 % increase over control. The highest yield was recorded by the chemical check chlorpyriphos + dichlorvos @ 2.5 + 1ml/l (1263.67 Kg/ha) with 155.58 % increase over control and significantly superior over other treatments.enweeds, control methods, drying, sowing, yields, developmental stages, herbicides, crops, grasses, harvestingPIGEONPEA, (Cajanus cajan (L.) Millsp.,), BIORATIONAL, INSECTICIDES”Thesis